1. NQR Group of INEOS AN SSSR: Nuclear Quadrupole Resonance In Chemistry (G K Semin et al., English Edition, John Wiley & Sons) (1975), 327
2. Semin, G.K.; Babushkina, T.A.; Robas, V.I.: Radiospektrosk Tverd Tela Dokl Vses Soveshch (1967), 218
3. Hashimoto, M.; Watanabe, M.; Takada, H.: J Magn Reson 34 (1979), 553
4. Hooper, H.O.; Bray, P.J.: J Chem Phys 33 (1960), 334
5. NQR Group of INEOS AN SSSR: Nuclear Quadrupole Resonance In Chemistry (G K Semin et al., English Edition, John Wiley & Sons) (1975), 483